Jet Fragmentation and MLLA

TL;DR

This paper evaluates the effectiveness of the Modified Leading Log Approximation (MLLA) in describing jet fragmentation, showing good agreement with experimental data across various energies and confirming the consistency of model parameters.

Contribution

It demonstrates that MLLA accurately models jet fragmentation phenomena and validates the consistency of parameters derived from different observables.

Findings

MLLA provides a good description of jet fragmentation across energies.

Model parameters from multiplicity and momentum distributions agree.

Charged particle multiplicity ratios in gluon and quark jets match model-independent results.

Abstract

Recent CDF results on inclusive momentum distributions and multiplicities of particles in restricted cones around jets are compared to predictions using the Modified Leading Log Approximation. We found that MLLA gives a very reasonable description of jet fragmentation for a wide range of energies. Model parameters are extracted separately from the multiplicity and from the shape of the momentum distributions and are found to agree. The ratio of charged particle multiplicities in gluon and quark jets measured in the context of MLLA is compared to the model-independent result and also found to agree.